(a) Under section 436 of the Plant Protection Act (7 U.S.C. 7756), a State or political subdivision of a State may not impose prohibitions or restrictions upon the movement in interstate commerce of articles, means of conveyance, plants, plant products, biological control organisms, plant pests, or noxious weeds if the Secretary has issued a regulation or order to prevent the dissemination of the biological control organism, plant pest, or noxious weed within the United States. The only exceptions to this are:

(1) If the prohibitions or restrictions issued by the State or political subdivision of a State are consistent with and do not exceed the regulations or orders issued by the Secretary, or

(2) If the State or political subdivision of a State demonstrates to the Secretary and the Secretary finds that there is a special need for additional prohibitions or restrictions based on sound scientific data or a thorough risk assessment.

(b) The regulations in this subpart provide for the submission and consideration of special need requests when a State or a political subdivision of a State seeks to impose prohibitions or restrictions on the movement in interstate commerce of articles, means of conveyance, plants, plant products, biological control organisms, plant pests, or noxious weeds that are in addition to the prohibitions or restrictions imposed by this part or by a Federal Order.